The downside to that approach is that it limits you to C calling conventions (most language communities are going to want to write in the target language) and means that the process will be as stable as the least stable plugin. Given how many bug reports were filed against every editor which has ever done that, it's easy to see the appeal of containment to the people working on an editor.
The other side of that is that we're not in the 90s with single core processors and there's been a lot of hardware & software optimization over time. Most people can run something like VSCode and a language server and still have multiple cores left over — and since the events which trigger language server interactions are generally made by a human with a keyboard it's not like you need to be in the microsecond range to keep up.
The other side of that is that we're not in the 90s with single core processors and there's been a lot of hardware & software optimization over time. Most people can run something like VSCode and a language server and still have multiple cores left over — and since the events which trigger language server interactions are generally made by a human with a keyboard it's not like you need to be in the microsecond range to keep up.